Laser auxiliary pre-stress shot blasting forming-strengthening composite process

Abstract

The invention discloses a laser-assisted prestressed composite method for shot blasting, forming and strengthening. The method is as follows: firstly, a workpiece is deformed as expected in an elastic range through a mechanical preloading method; secondly, the elastic energy concentration region of a part is scanned with a laser beam; thirdly, shot blasting is carried out to the workpiece along a laser scanning path. When the method is adopted for forming, the thermal effect of the interaction between the laser and a material can reduce the deformation resistance (elastic modulus and yield strength) of the material in a laser action region, and can assist the part in shaping through an inhomogeneous thermal stress field established in the thickness direction of the part, thereby the compression bending forming amount, forming efficiency and forming precision of a shaped part can be remarkably improved; moreover, the shot blasting immediately carried out later can strengthen the strain of a heat action region, so as to improve structural mechanical property.

Description

Laser-Assisted Prestressed Shot Peening-Strengthening Composite Method technical field The invention relates to the field of sheet metal structure forming, in particular to a laser-assisted prestressed shot-peening forming-strengthening composite method. Background technique There are such types of sheet metal parts in engineering, such as aircraft skin and overall (integrated skin and support ribs) panel parts, rocket integral fuel tank parts, ship side and deck parts, and car coverings, etc. , It needs to be formed by bending or rolling (another form of bending, the formed part can be rotated with the support roll while being bent). Press bending or roll bending is the main method of forming wall panels at present. The method uses a three-point bending method to form the wall plate, the wall plate is supported by two supporting points, and the loading device controls the pressure head to load on the predetermined position on the wall plate. The siding deforms plastica...

AI Technical Summary

Problems solved by technology

For aircraft skin and panel parts, due to their large size and complex structural shape, this method has small deformation, high forming difficulty, and cannot form parts with large local deformation and high ribs.

Its main manifestations are: large deformation resistance, large springback, prone to deformation damage (such as rib wrinkling and cracking, etc.), poor forming accuracy